1851 Great Exhibition: Official Catalogue: Class X.: J. C. Bishop
553. BISHOP, J. C., 1 Lisson Grove South — Designer and Manufacturer.
Cabinet organ, containing composition pedals, by which the performer can command any combination of stops, without the aid of the hands or confinement of the feet; the wind being also perfectly steady and free from tremor.
[Composition stops are used for changing the arrangement of organ stops, without the aid of the hands, and vary in different instruments.—H. E. D.]